with a regex. The simplest regex to find one or more tabs in the file was:grep '^This[[:space:]]\+5' parms*.txt

to show only the file names, use option-l

to search through compressed .bz2files, use bzgrep instead of grep

to search for words, use option-w

su and sudo -- both can take a user as a parm (superuser by default). The su switches to that user until you do exit, while sudo is followed by a command, that only this one command is executed in the assumed user context.

chown-R jboss:jboss_grp * -- change ownership of all files in this folder and below to user jboss, group jboss_grp.

adduser username -- add a new user and add user to the group. Once the user is created, to add user to the sudo group, repeat the same command with one more argument at the end: sudo

usermod -a -G sudo jdoe -- add user to group sudo

passwd user1 -- change password for user1. Use option -e to have force user to change it at the first login.